spcov: Sparse Estimation of a Covariance Matrix
Jacob Bien and Rob Tibshirani · 2012
Provides a covariance estimator for multivariate normal data that is sparse and positive definite. Implements the majorize-minimize algorithm described in Bien, J., and Tibshirani, R. (2011), "Sparse Estimation of a Covariance Matrix," Biometrika. 98(4). 807–820.